Bi-Heyting algebras, toposes and modalities

Journal of Philosophical Logic 25 (1):25 - 43 (1996)
The aim of this paper is to introduce a new approach to the modal operators of necessity and possibility. This approach is based on the existence of two negations in certain lattices that we call bi-Heyting algebras. Modal operators are obtained by iterating certain combinations of these negations and going to the limit. Examples of these operators are given by means of graphs
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DOI 10.1007/BF00357841
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References found in this work BETA
Anders Kock & Gonzalo E. Reyes (1977). Doctrines in Categorical Logic. In Jon Barwise & H. Jerome Keisler (eds.), Handbook of Mathematical Logic. North-Holland Pub. Co.. pp. 90.

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